MINISTRY OF SCIENCE AND TECHNOLOGY
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E-mail: ured@znanost.hr
Title: Tidal flow calculation in the Bakar bay
Title: Modeling of Water Movement in Concrete Sample
Title: Mathematical Modeling of Chloride Penetration into
Concrete
Title: Air pollution from a point source
Title: Tidal flow calcualtion in the bays with the wind action
Title: Numerical modelling of steel corrosion in reinforced
concrete sea structures
Faculty: Građevinski fakultet Zagreb
Author: BALABANIĆ GOJKO
Date of defense: 05/26/93
Language: hrvatski
Number of pages: 150
Summary: The mathematical model for the corrosion of steel
in
concrete exposed to seawater was developed in this thesis in
order to enable calculation of the corrosion current
density, i.e. of the corrosion rate. The calculation was
made for the case when the concrete was placed in the splash
zone and for the case fully immersed concrete into the
seawater. The mathematical model of transport processes
significant for the steel corrosion in concrete exposed to
seawater includes: transport of capillary water, oxygen,
chloride ions and hydroxyl ions through the concrete cover,
as well as sources and sinks of the these scalar fields.
These physical processes are described using the system of
partial differential equations that were solved using finite
element method in the spatial domain and using finite
difference method in time domain, for axi-symmetric problem.
The spatial domain is represented by the cylindrical
concrete specimen with the steel bar on its axis.
Keywords: corrosion,steel,modelling,sea,finite elements, polarization,potential
Title: Mathematical model for simulation of the circulation and
of the quality of coastal sea
Faculty: Arhitekture gradbeništva in geodezije Ljubljana
Author: IVANOVIĆ MARKO
Date of defense: 04/13/91
Language: slovenski
Number of pages: 140
Summary: A threedimensional hydrodynamical model for the calcualtion
ofcurrents in the fluid of constant density was built. The basisfor the
model is a twodimensional model which was built inaccordance to the work of
Leendertse (1967). This was furtherdeveloped to a threedimensional model
following the idea ofLardner (1989). This is the reason why the
calculations realisedon the personal computer are much quicker then for the
modelsthat are threedimensionaly treated.
In the twodimensional case we model nonlinear differentialequations, which
are a modification of Navier-Stokes equations.In the threedimensional case
we linearize the equations.
In both cases we use the method of finite differences, and thewprogram is
writen in FORTRAN code.
The boundary values are treated as influenced by wind and tidealeffects,
the bottom friction was modeled in accordance toDronkers (1964).
The model was verified with an analitical solution and with theexamples of
practical calculations done by Leendertse and Rajar,which were on their
side verified with field measurements. As afinal use of the model we
present the results for the case of thebay of Rijeka under the influence of
a southern wind and tides onthe open boundary.
The calculated current fields can be effectively used inengineering praxis
in coastal seas and great lakes. THe modlecould be further built on by
equations for the transport ofheath, salts or polutants, what is realy the
basis of modelingthe water quality.
Keywords: shallow sea water equatins tides wind stress numerical 3D - model finite difference verification
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